Whats the thinnest wire you can imagine? As thin as a human hair? Half that thickness? Try again. Using a narrowly focused beam of electrons, researchers at at Oak Ridge National Laboratory have created metallic wires that are just three atoms wide. Thats 1/1,000 of the width of wires typically found in modern circuits, themselves microscopic.

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Combining the metals molybdenum or tungsten with either sulfur or selenium results in materials known as transition-metal dichalcogenides, or TMDCs. TMDCs are a family of semiconducting materials that naturally form monolayers. Junhao used a scanning transmission electron microscope (STEM) that is capable of focusing a beam of electrons down to a width of half an angstrom

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